Why do the transition metal ions exhibit characteristic colours in aqueous solution. Explain giving examples.

How would you account for the following ? Most of the transition metal ions exhibit characteristic colours in aqueous solutions.

Why do most transition metal ions exhibit paramagnetism ?

Why do transition elements exhibits characteristic properties ?

The ion which exhibits orange red colour in aqueous solution is

Which one of the following transition metal ions is colourless in aqueous solution ?

The following ion exhibits colour in aqueous solution ?